Spring Heater Box Cleaning - Damage Found

I appreciate the responses all.

While I think I'd like to stick with the glass, JB Weld seems like the easiest route and glad to hear toplscuda has had good results with its longevity under duress.

Rusty - watching fiberglassing makes it look fairly easy, but with this car anything that looks or should be very easy...isn't. Are those repair kits usually pretty good quality and straightforward to do on something like this that needs to come out smooth and strong matching that arc after cleanup/sanding/etc. for a fiberglassing noob?

And 4spddragtop, I got new clips with the DMT rebuild kit, so I'll definitely loosen them a bit before popping them on. The glass is fragile for sure and was a bit chippy when I popped off the originals. Thanks for the advice.